{"affected":[{"defaultStatus":"unaffected","ecosystem":"pypi","packageName":"apache-airflow","product":"Apache Airflow","source":"CNA: apache","vendor":"Apache Software Foundation","versions":[{"lessThan":"3.0.0","status":"affected","version":"0","versionType":"semver"}]},{"defaultStatus":"unaffected","ecosystem":"pypi","packageName":"apache-airflow-core","product":"Apache Airflow","source":"CNA: apache","vendor":"Apache Software Foundation","versions":[{"lessThan":"3.3.1","status":"affected","version":"3.0.0","versionType":"semver"}]}],"cveId":"CVE-2026-59242","cwes":["CWE-502"],"description":"Apache Airflow's XCom `GET /api/v2/{...}/xcomEntries/{key}?deserialize=true` endpoint passed a string-literal payload through `BaseXCom.deserialize_value` without the `_check_forbidden_xcom_keys` guard, allowing an authenticated API user with XCom write-and-read access to instantiate arbitrary `airflow.*` classes on the API server (CWE-502). An authenticated user who can write an XCom value and then read it back with `deserialize=true` triggers the unsafe instantiation. Users are advised to upgrade to apache-airflow 3.3.1 or later, which rejects reserved XCom serialization keys submitted as JSON string literals.","epss":{"date":"2026-11-02","percentile":0.44753,"score":0.00529},"exploits":[],"kev":null,"metrics":[{"score":5.4,"severity":"medium","source":"ADP: CISA-ADP","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"}],"modifiedAt":1793689131061,"publishedAt":1786548900763,"references":[{"source":"CNA: apache","tags":["patch"],"url":"https://github.com/apache/airflow/pull/69378"},{"source":"CNA: apache","tags":["vendor-advisory"],"url":"https://lists.apache.org/thread/dm0520yhh4mn7qknyoh45r2w6c5qg2mg"},{"source":"ADP: CVE","tags":[],"url":"http://www.openwall.com/lists/oss-security/2026/08/12/6"}],"remediation":[{"kind":"fix","source":"CNA: apache","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/apache/airflow/pull/69378"}],"revision":"6de2c10ece9a4847199d403e93e3fc42182638525f09baf818b03e6233687053","sources":[{"modifiedAt":1793689131061,"name":"CNA: apache","retrievedAt":1793689772215,"url":"https://www.cve.org/CVERecord?id=CVE-2026-59242"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793689785271,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-59242"}],"ssvc":{"assessedAt":1786552911650,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Apache Airflow: Arbitrary airflow.* class instantiation on the API server via the XCom deserialize endpoint","updatedAt":1793689785271}